Working Together

As we execute our vision of becoming an industry leader, we are focused on growing our market, client service, and geographic reach by adding dynamic and diverse organizations to our family of companies.


  • Transportation Engineering
  • Mobility Planning
  • Construction Management
  • Intelligent Transportation Systems (ITS)
  • Grant Writing and Management
  • Safety Implementation

KOA Corporation, a Lochner Company, specializes in transportation engineering, mobility planning, and construction management for public agencies and private sector clients. KOA’s mission is to create a safe, accessible, and sustainable transportation environment that embodies diversity, equity, and inclusion for future generations. KOA provides professional consulting services for some of Southern California’s largest public-works and planning projects, across all modes of transportation.

Lochner acquired KOA in December 2022. The firm has offices in Monterey Park, Orange, Ontario, and San Diego, California.

Armstrong Consultants

  • Airport Planning
  • Environmental
  • Engineering and Design
  • Construction Administration

Armstrong Consultants, a Lochner Company, specializes exclusively in airport planning, engineering, and construction administration services. Serving the airport community since 1985, Armstrong has completed over 3,000 improvement projects at more than 130 airports, ranging from small rural general aviation airports to business jet executive airports, commercial service airports, and military airfields throughout the western United States.

Lochner acquired Armstrong Consultants in December 2022. The firm has offices in Grand Junction, CO; Albuquerque, NM; Casper, WY; Denver, CO; Phoenix, AZ; Reno, NV; and Santa Rosa, CA.

K Friese + Associates

  • Water/Wastewater
  • Transportation
  • Drainage
  • Community Planning
  • Construction Services
  • Municipal Engineering

K Friese + Associates, a Lochner Company, is an established and trusted civil engineering consultancy providing water/wastewater, drainage, transportation, aviation, and municipal services to a diverse range of public sector clients in large and small communities throughout the State of Texas.

Lochner acquired K Friese + Associates in May 2023. The firm is headquartered in Austin, Texas, with additional offices in Houston, Round Rock, and San Antonio.


  • Aviation
  • Municipal Infrastructure
  • Roads and Highways
  • Transit/Railroad
  • Water/Wastewater

Founded in 2003 by brothers Jonnie Thomas and Marvin Thomas, Triunity delivers best-in-class program/project management and controls, construction management, and specialized communication systems/electrical engineering services for transit and rail agencies, as well as road and highway, aviation, water and wastewater, and municipal clients throughout the U.S.

Lochner acquired Triunity in November 2023. The firm is headquartered in Denver, CO, with additional offices in Los Angeles, CA; and Seattle, WA.

Join Our Growth Journey

Contact us

Ready to take your company to new heights? Partnering with Lochner provides a national presence with scale and resources to meet client needs, supportive shared service operations, and a culture of inclusion where every member of our team is accepted, heard and respected, and unique talents, abilities, and career aspirations are realized. 

Join us and unlock a world of possibilities.